One thing you could do is set your ISIMinDuration and ISIMaxDuration both to 5 s. Then you'll set your SequenceType to deterministic, and set your Sequence to something like "1 2 3 4 5", where 1 is your first cue, and "2" is the first 5 seconds of your second cue, "3" is the next 5 seconds, etc etc.

Hello Boulay,
Thanks for the reply. I have done it like this. Min and Max Inter stimulus Interval is set to zero. stimulus duration set to 5 secs. Sequence is
1 2 2 2 2 and sequence type is deterministic mode. . I want to get it the same in random mode. what I mean is it has to treat 2 2 2 2 as one cue and 1 as one cue and produce them randomly. Sorry if I confused you. Can it be possible.
Many Thanks in advance.
Regards.

I have a script that randomizes my stimulus cues and saves them to a .prm file that is automatically loaded by the batch file.
Below is some Python code. In this example, you end up with something like "5 1 5 2 5 4 5 5 5 3 5 2 5 1 5 4"
(I used 1,2,3,4 as up,down,left,right, 5 is center. So it's center-up-center-down-center-center-center-left- etc)